Search Results

You are looking at 1 - 10 of 474 items for :

  • "nutrient management" x
  • All content x
Clear All
Free access

P. Diane Relf and David McKissack

The Virginia Gardener Nutrient Management Education Program addressed non-point, urban-runoff pollution of Virginia's streams, estuaries, and groundwater, and included a calendar aimed at alerting the garden consumer to the connection between overfertilization and water pollution. Over 15,000 calendars were requested.

A survey of calendar recipients was conducted. 1500 persons were chosen at random, a subsequent address check confirmed adequate distribution among the regions of the state. The response rate was 28%. Responses indicated that 91.3% of those surveyed had changed their garden practices in some way because of the calendar. 90% of the respondents indicated that the calendar had shown them a connection between proper gardening techniques and water quality, with 82.2% indicating the calendar had been moderately to greatly successful in showing them this connection.

The 1989 Virginia Gardener Calendar was an effective method of educating garden consumers about the connection between water quality and nutrient runoff, and cultural practices which lessen the need for fertilizer in the home garden.

Full access

Xin Zhao, Qianqian Dong, Shubang Ni, Xiyong He, Hai Yue, Liang Tao, Yanli Nie, Caixian Tang, Fusuo Zhang, and Jianbo Shen

( He et al., 2017 ). However, soil and nutrient management for macadamia production is still in its infancy. Many guide brochures on the Macadamia grower’s handbook have been used in Australia and America ( Bittenbender and Hirae, 1990 ; O’Hare et al

Full access

Carolyn DeMoranville

,500 acres in the United States with Massachusetts producing 27.7% of the national crop on 30.6% of the acreage ( U.S. Department of Agriculture, 2015 ). Nutrient management for cranberries in Massachusetts is not different from that in other crops: support

Full access

Marvin P. Pritts

). Although strawberry leaves are not strictly deciduous, many will die before the onset of winter. The general approach to nutrient management in perennial strawberry production is not dissimilar to management in temperate tree fruit and grape ( Vitis sp

Free access

Ronald Voss, Marita Cantwell, Blaine Hanson, Donald May, and Robert Rice

Garlic is a cool-season vegetable crop with a long growing season. The potential nutrient and water needs are high. Irrigation and fertilization trials were conducted in the San Joaquin Valley in varying weather and different soils. Objectives were to relate fertilizer and irrigation management to garlic yield and to the efficiency of water and fertilizer use;to develop crop coefficients relating crop ET to reference crop ET; to relate postharvest quality to water nutrient management; and to determine if slow-release nitrogen fertilizers are as effective as more soluble forms. N, P, and K rates and timing of applications were applied. Furrow irrigation variables included calendar timing, cutoff date of last irrigation, irrigation at different available soil moisture (ASM) depletion, and irrigation based on evapotranspiration. A line source sprinkler irrigation was also conducted. Response to fertilizer nitrogen and to irrigation were dependent on soil type and depth. Response in heavy, deep soil was poor; response in lighter texture and shallower soil was much greater. Garlic extracted water and nutrients to depths greater than 120 cm and suffered no yield loss at high ASM depletion (50%) in deep, heavy soil. In shallow or lighter texture soil, extraction was limited to 60 cm, with highest yields when irrigated at 25% ASM depletion. Yield and quality of garlic were affected by irrigation cutoff date. Nitrogen response varied from ≈100 to more than 300 kg/ha. Slow-release nitrogen fertilizers were effective, but not economical. Little or no response to P or K fertilizer was measured in these experiments. Effects of excessive fertilizer rates on postharvest quality was variable.

Full access

Gregory S. Hendricks, Sanjay Shukla, Kent E. Cushman, Thomas A. Obreza, Fritz M. Roka, Kenneth M. Portier, and Eugene J. McAvoy

need to be compared with the recommended practices with special emphasis on yield performance and farm profitability. This study evaluated three water and nutrient management systems for watermelon production in southern Florida with regard to

Full access

John D. Lea-Cox, Ellen N. Varley, David S. Ross, and K. Marc Teffeau

The State of Maryland Legislature enacted the Water Quality Improvement Act in 1998, which requires all agricultural operations to develop and implement nitrogen- and phosphorus-based nutrient management plans by December 2002. This legislation also mandates the education and training of professionals who will write nutrient management plans, and growers who will implement them. Maryland Cooperative Extension faculty have therefore been charged with developing effective educational programs that will enable nursery and greenhouse industry professionals to achieve these goals and ensure industry compliance with this legislation.

Free access

John D. Lea-Cox

In 1998, the state of Maryland adopted some of the toughest nutrient management planning regulations in the Nation, requiring virtually all agricultural operations plan and implement nitrogen and phosphorus-based management plans by Dec. 2002. The nursery and greenhouse industry is faced with a far more complicated nutrient management planning process than traditional agronomic planning scenarios. Factors include a large number (>500) of plant species, various fertilization and irrigation strategies, with crop cycles ranging from 6 weeks (bedding plants) to upwards of 15 years for some tree species in field production, often with a lack of knowledge of specific nutrient uptake rates and utilization. In addition, unique infrastructural and site characteristics that contribute to water and nutrient runoff from each nursery contribute to a multitude of variables that should be considered in the planning process. The challenge was to identify a simple, effective process for nutrient management planning that would a) provide an accurate assessment of nutrient loss potential from this wide variety of production scenarios, b) identify those specific factors that contribute most to nutrient leaching and runoff, and c) provide a mechanism to economically assess the various risk management (mitigation) scenarios. This risk assessment process provides information on a number of fixed (site) and dynamic (management) variables for soils/substrates, irrigation and fertilization practices, together with any surface water management systems (e.g. containment ponds, riparian buffers). When all the risk factors for a nursery are evaluated and scored, the complete picture of risk assessment then emerges. By identifying higher risk factors and evaluating different risk management options, the grower and/or nutrient management planner can then choose economic alternatives to reduce the potential for nutrient runoff.

Full access

Monica Ozores-Hampton

). However, with the adoption of best management practices (BMPs), soil health can be improved while simultaneously optimizing nutrient management. Best management practices, which include cover crops, compost, and other soil amendments, are nonregulatory

Free access

Yan Chen, Regina Bracy, and Roger Rosendale

While herbaceous perennials continuously gain popularity in southern landscape plantings, the nutrient requirements of many species in this group are still unknown. The business goal of lawn and garden care companies emphasizes aesthetic value of the urban landscape. Improper nutrient management, such as the overapplication of fertilizers, is inefficient and may result in increased pest problems and risks of contaminating ground and surface waters by nutrient runoff. Seven herbaceous perennials (lantana, rudbeckia, purple cone flower, daylily, mexican heather, cigar plant, and guara) were planted in simulated landscape beds. Fertilizers applied included one or two OsmocotePlus 16-8-12 tablets (7.5 g), OsmocotePlus 15-9-12 (5 months) at 0, 33, 66, and 131 g/m2 at planting, or applying OsmocotePlus 15-9-12 (5 months) 33 g/m2 or one OsmocotePlus tablet at the time of planting plus another 33 g/m2 topdressing after flowering. Plant growth of rudbeckis, purple cone flower, and lantana were highest at 131 g/m2 applied at planting, but resulted in similar overall plant quality as with 33 or 66 g/m2 treatments. Daylily growth was similar across fertilization treatments, and overall quality decreased at high fertilization rates with more severe daylily rust observed on these plants. Applying one OsmocotePlus 7.5-g tablet resulted in similar plant quality with applying OsmocotePlus 33 and 66 g/m2, but significantly reduced the amount of fertilizer used. Additional topdressing after flowering did not further increase plant quality in fall, but may affect the overwintering survival of perennial plants.